Coolant drill head

ABSTRACT

Coolant hole drills are very costly and by that are times not used as often as they could be. By utilizing a coolant drill head, the material could be cobalt or carbide, the coolant drill costs would be reduced substantially. The problem users encounter with replaceable drill heads is strength and concentricity. Here is a system that maintains both strength and concentricity.

[0001] Regarding the replaceable coolant drill head, according to the description, the drill head is fitted onto the end of the coolant drill body by means of a precise small cylindrical shaft and protruding channel. The channel on the drill head is machined and ground to precise dimensions. The small shaft is also ground to specific dimensions. These together are fitted onto the end of the drill body, which have a ground hole and ground slot for the drill head to fit into. By utilizing these two ground parts of the drill head to insert into the drill body, concentricity has been reached, which is a major problem with other systems. Coolant holes are machined through the drill head to allow coolant to pass through. The exiting holes in the drill body have been threaded to allow the head to be attached. Screws are inserted through the drill head to screw into the drill body to hold the head on. Holes have been machined through the center of these screws to allow coolant to pass.

[0002] Coolant enters the drill body from the spindle of the machine, runs down through the existing coolant holes in the body of the drill and then runs through the machined holes in the screws that hold the head on and out the end of the drill. The torque during the operation of the coolant drill head is absorbed by the locking channel which makes the system very rigid.

[0003] There is no torque on the screws that hold the head on.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

[0004] There has been no federally sponsored research and development in the inception of this invention.

BACKGROUND

[0005] Coolant fed drills are very costly with their specialty grades of steel and Carbide grades. What is achieved is a much stronger replacement drill head in which side holes and locking screws have been eliminated so as to increase strength and rigidity. This invention utilizes existing coolant holes, so not to weaken the drill any more, for locking on the replacement coolant drill head. 

1. In using this system of replaceable drill head, concentricity and durability is achieved by not using side locks or side screws to lock on in holding the head to the drill body, which then causes a concentricity problem and overall weakens the drill. 